We talking about the same connector? F is the same one
used to TV RF.
Likely that's why they didn't use it (confuse 'net with video). However
both are about the same size (give or take a few thousanths). The F
connector uses solid conductor wire. That may have been the reason
there too, solid center is less flexible..
Not to mention all the noise problems when the film on the center conductor
is not scraped off when you assemble them. At least with BNC you have a
gold plated pin that is either soldered or crimped that is making the actual
connection. If it were not for the bad connection problems I have
encountered I would gladly use F connectors.
Dan